Design of current mode controlled SEPIC DC-DC converter for MPPT control of wind energy conversion systems
22 Apr 2015-pp 0177-0182
TL;DR: In this paper, a small-signal modeling of a single-ended primary inductor converter (SEPIC) employed wind energy conversion system is presented for fast tracking of maximum power point under turbulent wind conditions.
Abstract: Maximum power extraction from wide range of wind velocity profiles is possible with single-ended primary inductor converter (SEPIC) employed wind energy conversion systems. Effective feedback control is necessary for fast tracking of maximum power point under turbulent wind conditions. This paper presents small-signal modeling of SEPIC converter using state-space averaging (SSA) technique. Required dynamic small-signal linear model's transfer functions for the feedback controllers' design are derived. Response of the system against fast changing reference inputs is verified through simulation results.
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01 Oct 2019
TL;DR: The indirect self-tuning adaptive controller has been proposed which consists of two parts: identification and control signal production, moreover robust adaptive controller is designed based on estimator improvement.
Abstract: This paper presents the design of a controller based on robust adaptive control applied to a non-minimum phase Sepic1 converter by PWM2 method. The mathematical modeling, used to display the frequency response characteristic, is presented by the average model of the converter. The proposed system is a fourth order non-minimum phase system which is approximated to a second order system based on frequency characteristics of the system. By considering noise, nonlinear properties, disturbances, unmodeled dynamics, and variation of injected voltage to the system, some limitations are discussed in designing of the controller. In this case, conventional controllers are not so useful, therefore the indirect self-tuning adaptive controller has been proposed which consists of two parts: identification and control signal production, moreover robust adaptive controller is designed based on estimator improvement. Finally, the simulations are performed by using MATLAB-Simulink and the effectiveness of the controller will be shown.
7 citations
Cites background from "Design of current mode controlled S..."
...Based on Sepic system characteristics which are consisted of uncertainty, non-linearity, input voltage variations, load disturbances and parametric variations, the conventional controllers are not so useful in this case and can’t assure the stability of the system [5,6,7]....
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01 May 2019
TL;DR: This paper gives a detailed derivation of the equations governing the SEPIC, and an example of sizing of components is presented for a range of input voltages and power levels.
Abstract: The purpose of the paper is to guide engineering students and ease their transition from the most basic DC-DC converter topologies to more advanced types. The buck, boost and buck-boost converters are the usual suspects in textbooks and engineering classes to introduce students to the basics of power electronics and switch mode power supplies. There is a gap of how detailed such second order DC-DC converters are described and the more advanced fourth order such as the Cuk, Zeta and Single-Ended Primary-Inductor Converter (SEPIC). This paper gives a detailed derivation of the equations governing the SEPIC. An example of sizing of components is presented for a range of input voltages and power levels. Finally the design is verified by a circuit simulation using LTSpice.
2 citations
Cites background from "Design of current mode controlled S..."
...Similarly for L2 the applied voltage during the off state is vL2 = Vo, and thus ∆iL2 = (1 −D)VoTs L2 (12)...
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TL;DR: Average Current Mode (ACM) controlled synchronous DC–DC converters are increasingly required for computer power supplies and electric vehicle battery chargers.
Abstract: Average Current Mode (ACM) controlled synchronous DC–DC converters are increasingly required for computer power supplies and electric vehicle battery chargers In this study, Generalized Hopfield N
References
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Book•
01 Jan 1962TL;DR: This new edition of Automatic Control Systems features a new, accessible approach for students taking introductory courses on control systems while retaining the depth and rigor of Benjamin Kuos classic, best-selling text.
Abstract: From the Publisher:
Automatic Control Systems Seventh Edition Benjamin C. Kuo Updated to reflect the increasing use of computer-aided learning and design, the seventh edition of Automatic Control Systems features a new, accessible approach for students taking introductory courses on control systems while retaining the depth and rigor of Benjamin Kuos classic, best-selling text. This new edition integrates several real world applications throughout the text, covering both analysis and design. Other new features include:*demonstration of the solution of complex problems with the aid of computer software*thorough discussion of steady-state error analysis, including nonunity-feedback systems*discussion of circuit realization of controller transfer functions*simplified treatment of Nyquist criterion on systems with nonminimum-phase transfer functions*discussion of time-domain and frequency-domain designs side by side in one chapter*added chapter on design of discrete-data control systemsThe text also includes an abundance of illustrative examples, problems, and marginal notes to highlight important points and comments. Contents include full chapters on: mathematical foundation transfer functions, block diagrams, and signal-flow graphs mathematical modeling of physical systems state-variable analysis stability of linear control systems time-domain analysis of control systems root-locus techniques frequency-domain analysis design of control systems design of discrete-data control systems
2,519 citations
TL;DR: In this article, the operation and control of a variable-speed wind generator is described, which is connected to the power network by means of a fully controlled frequency converter, which consists of a pulsewidth modulation (PWM) rectifier, an intermediate dc circuit, and a PWM inverter.
Abstract: Wind energy is a prominent area of application of variable-speed generators operating on the constant grid frequency. This paper describes the operation and control of one of these variable-speed wind generators: the direct driven permanent magnet synchronous generator (PMSG). This generator is connected to the power network by means of a fully controlled frequency converter, which consists of a pulsewidth-modulation (PWM) rectifier, an intermediate dc circuit, and a PWM inverter. The generator is controlled to obtain maximum power from the incident wind with maximum efficiency under different load conditions. Vector control of the grid-side inverter allows power factor regulation of the windmill. This paper shows the dynamic performance of the complete system. Different experimental tests in a 3-kW prototype have been carried out to verify the benefits of the proposed system.
1,298 citations
"Design of current mode controlled S..." refers background in this paper
...Outer speed/voltage loop generates torque/current command that will be translated into current commands to the machine control system [4]....
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01 Jan 2013
TL;DR: This chapter gives a description and overview of power Electronic technologies including a description of the fundamental systems that are the building blocks of power electronic systems.
Abstract: This chapter gives a description and overview of power electronic technologies including a description of the fundamental systems that are the building blocks of power electronic systems. Technologies that are described include: power semiconductor switching devices, converter circuits that process energy from one DC level to another DC level, converters that produce variable frequency from DC sources, principles of rectifying AC input voltage in uncontrolled DC output voltage and their extension to controlled rectifiers, converters that convert to AC from DC (inverters) or from AC with fixed or variable output frequency (AC controllers, DC–DC–AC converters, matrix converters, or cycloconverters). The chapter also covers control of power converters with focus on pulse width modulation (PWM) control techniques.
1,152 citations
"Design of current mode controlled S..." refers methods in this paper
...In this work, state-space averaging [SSA] method [5] is used for small-signal modeling of SEPIC converter....
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TL;DR: The question of theoretical stability of the torque controller is addressed, showing that the rotor speed is asymptotically stable under the torque control law in the constant wind speed input case and L/sub 2/ stable with respect to time-varying wind input.
Abstract: This article considers an adaptive control scheme previously developed for region 2 control of a variable speed wind turbine. In this paper, the question of theoretical stability of the torque controller is addressed, showing that the rotor speed is asymptotically stable under the torque control law in the constant wind speed input case and L/sub 2/ stable with respect to time-varying wind input. Further, a method is derived for selecting /spl gamma//sub /spl Delta/M/ in the gain adaptation law to guarantee convergence of the adaptive gain M to its optimal value M*.
488 citations
"Design of current mode controlled S..." refers background in this paper
...To extract maximum power from varying wind, wind turbine speed should be controlled w.r.t. wind velocity variations [2]....
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